silence "missing print.h" warning

(cherry picked from commit 3c18b7d3)
14 jobs for silence-warning-v9_12 in 9 minutes and 50 seconds (queued for 4 seconds)
Status Job ID Name Coverage
  Precheck
passed #49729
amd64 docker linux
precheck:debian:sid:amd64

00:00:18

 
  Build
passed #49730
amd64 docker linux
build:centos:centos6:amd64

00:02:55

passed #49731
amd64 docker linux
build:centos:centos7:amd64

00:03:25

passed #49732
amd64 docker linux
build:debian:sid:amd64

00:02:58

passed #49733
i386 docker linux
build:debian:sid:i386

00:02:49

 
  Test
passed #49742
amd64 docker linux
install:debian:sid:amd64

00:03:28

passed #49738
amd64 docker linux
systemtest:centos:centos6:amd64

00:05:19

passed #49739
amd64 docker linux
systemtest:centos:centos7:amd64

00:05:51

passed #49740
amd64 docker linux
systemtest:debian:sid:amd64

00:05:08

passed #49741
i386 docker linux
systemtest:debian:sid:i386

00:06:06

passed #49734
amd64 docker linux
unittest:centos:centos6:amd64

00:00:57

passed #49735
amd64 docker linux
unittest:centos:centos7:amd64

00:01:01

passed #49736
amd64 docker linux
unittest:debian:sid:amd64

00:01:01

passed #49737
i386 docker linux
unittest:debian:sid:i386

00:00:57